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An alternative quantum fidelity for mixed states of qudits |
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| Authors: | Xiaoguang Wang Chang-Shui Yu |
| Affiliation: | a Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, HangZhou 310027, PR China b Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong, Hong Kong c School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, PR China |
| Abstract: | We give an alternative definition of quantum fidelity for two density operators on qudits in terms of their Hilbert-Schmidt inner product and their purity. It can be regarded as the well-defined operator fidelity for the two operators and satisfies all Jozsa's four axioms up to a normalization factor. This fidelity is not computationally demanding. |
| Keywords: | 05.45.Mt 03.65.Nk 03.65.Yz |
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